Forum Discussion
Custom Rule to qurantine emails in M365 based on total Number of Recipients
Lately we have been getting thousands of emails from Gmail which have pdfs and links. Last week we were hit with around 1.5 million emails which the ATP could not stop( we have A5 license). We create...
Unfortunately no way to configure such rules in Exchange Online. You would need a custom transport agent to do something like that, and such are not available in Exchange Online.
Thanks I had raised a User Voice for the same a month or so back, last time when we were getting hit
https://feedbackportal.microsoft.com/feedback/idea/2acd6e42-f9f1-ee11-a73d-000d3a04e3e2
If that was implemented this would have helped us.